Year	% gross
1971	30.8779106140137
1972	32.7399787902832
1973	35.4456405639648
1974	38.3167304992676
1975	41.8625984191895
1976	45.278621673584
1977	48.2403182983398
1978	53.4311218261719
1979	58.1076507568359
1980	61.0017318725586
1981	62.341869354248
1982	62.790699005127
1983	64.0105819702148
1984	65.5251007080078
1985	68.0090789794922
1986	72.0007171630859
1987	73.9929428100586
1988	72.9330825805664
1989	70.9929275512695
1990	71.3200607299805
1991	71.7966384887695
1992	72.7785034179688
1993	75.0166625976563
1994	78.133171081543
1995	78.1489105224609
1996	78.8927688598633
1997	79.6735763549805
1998	79.4537887573242
1999	78.7725067138672
2000	79.8827667236328
2001	81.5035095214844
2002	83.5226211547852
2003	86.1720809936523
2004	87.8400573730469
2005	88.5623931884766
2006	89.4444885253906
2007	90.7831115722656
2008	93.6049880981445
2009	97.6626968383789
2010	100.481719970703
2011	100.688079833984
2012	103.050270080566
2013	99.9055328369141
2014	100.614028930664
2015	103.511749267578
2016	103.980522155762
2017	103.822257995605
2018	102.783012390137
2019	102.221313476563
2020	102.607238769531